EP0763425B1 - Matériaux thermographiques et photothermographiques pour la production d'éléments d'impression lithographique et leurs procédés de fabrication - Google Patents
Matériaux thermographiques et photothermographiques pour la production d'éléments d'impression lithographique et leurs procédés de fabrication Download PDFInfo
- Publication number
- EP0763425B1 EP0763425B1 EP19960202455 EP96202455A EP0763425B1 EP 0763425 B1 EP0763425 B1 EP 0763425B1 EP 19960202455 EP19960202455 EP 19960202455 EP 96202455 A EP96202455 A EP 96202455A EP 0763425 B1 EP0763425 B1 EP 0763425B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ingredient
- thermosensitive layer
- hydrophobic
- layer
- hydrophilic surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 150000001467 thiazolidinediones Chemical class 0.000 description 1
- 150000003549 thiazolines Chemical class 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical class NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- ZZKYNWVJXAXFKI-UHFFFAOYSA-N tribromomethyl benzenesulfinate Chemical compound BrC(Br)(Br)OS(=O)C1=CC=CC=C1 ZZKYNWVJXAXFKI-UHFFFAOYSA-N 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000001018 xanthene dye Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
- B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
- B41C1/1016—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/494—Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
- G03C1/498—Photothermographic systems, e.g. dry silver
- G03C1/4989—Photothermographic systems, e.g. dry silver characterised by a thermal imaging step, with or without exposure to light, e.g. with a thermal head, using a laser
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/34—Imagewise removal by selective transfer, e.g. peeling away
- G03F7/346—Imagewise removal by selective transfer, e.g. peeling away using photosensitive materials other than non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/02—Positive working, i.e. the exposed (imaged) areas are removed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/14—Multiple imaging layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers
Definitions
- the present invention relates to the production and application of lithographic printing plates. More specifically the invention is related to a lithographic plate on which ink receptive images may be formed by a process involving an image-wise thermal development process.
- Lithography is a process in which printing takes place from a plate with specially prepared surfaces, some areas of which are capable of accepting lithographic ink, whereas other areas, when moistened with water, are incapable of accepting the ink.
- the areas of the medium being printed which accept ink from those plate areas which have accepted ink, form the printing image areas, while those in contact with those plate areas unable to accept ink, form the background areas.
- areas of the lithographic plate capable of accepting the ink will be referred to as hydrophobic and those incapable, after prewetting with water, of accepting this ink will be referred to as hydrophilic.
- Image-wise treatment, or image-wise treatment corresponding to the negative of the image, for the production of lithographic printing plates can be carried out using actinic radiation, ionized radiation or heat, or a combination thereof in combination with appropriate processing of the plates.
- thermographic or photothermographic materials in the production of lithographic printing plates opens the possibility of using dry development techniques, which have the advantage, over conventional processes requiring development with externally applied (wet) developers, of being entirely dry processes developable without additional ingredients.
- Thermal imaging or thermographic processes utilizing the reduction of substantially light-insensitive organic heavy metal salts by organic reducing agents to heavy metal particles upon the application of heat, are entirely dry processes developable without additional ingredients. Furthermore, such systems can be rendered photosensitive by the incorporation of a photosensitive agent capable after exposure of catalyzing the thermal reduction of the organic heavy metal salts by the reducing agents.
- a process for forming an image is described in US-P 4,210,711, comprising the image-wise exposure of a photosensitive image-forming material composed of a support and a layer of a thermoplastic photosensitive composition which is not adhesive at ordinary temperatures, heating the exposed photo-sensitive material in intimate contact with a peeling development carrier sheet at least one surface of which is composed of a thermoplastic material not adhesive at ordinary temperature to a temperature above the softening temperature of at least one of the photo-sensitive composition layer and the peeling development carrier-sheet from the photo-sensitive image-forming material at about or below the heating temperature thereby to form the exposed or unexposed area of the photo-sensitive composition layer on the peeling development sheet, and the corresponding unexposed or exposed area on the support, respectively as a separate image wherein the photo-sensitive composition contains a photosensitive polyhalogen compound, a photosensitive quinone, a photosensitive polymer, a silver halide or an organic silver salt.
- thermographic lithographic printing plate is described in US-P 3,685,993 with a composition comprising a complex of a heat fusible phenolic resin and a high molecular weight water-soluble poly-ether, -amine or -amide polymer, and an organic silver salt oxidizing agent for the resin, the composition undergoing a visible change upon heating to form ink-receptive image areas.
- US-A 3,679,414 discloses a lithographic plate having a thin oleophilic ink-receptive layer on a hydrophilic substrate, said oleophilic layer being readily removable by washing with a solvent mixture of organic solvent from the group consisting of water-miscible alcohols and ketones and water, said layer containing as an essential ingredient an oxidizable, low molecular weight poly(monohydroxyphenyl) aromatic organic compound soluble in water-miscible alcohols and ketones and having a hydrogen or methyl radical in ortho or para position to the hydroxyl radical and which on oxidation does not form a stable quinoid structure, together with a lesser amount by weight of a chemically inert film-forming binder, said coating, when briefly heated with a quantity of water-insoluble silver soap just sufficient to oxidize all of said compound and in the presence of phthalazinone as a catalyst for such oxidation reaction, being rendered resistant to attack by said solvent mixture.
- thermographic processes for the production of lithographic plates are insufficient to yield high quality prints.
- lithographic plates have sub-optimal printing properties e.g. insufficient ink-acceptance in the hydrophobic areas of the lithographic plate, low printing endurance etc.
- thermographic material capable of being used to produce a lithographic printing plate with improved discrimination in ink-receptive behaviour between image and non-image areas of the lithographic printing plate.
- thermographic material capable of being used to produce a lithographic printing plate with improved printing endurance.
- thermographic material comprising a support, a hydrophobic thermosensitive layer and a hydrophilic surface adjoining the hydrophobic thermosensitive layer, the hydrophobic thermosensitive layer containing an ingredient A which upon heating reacts with at least one other ingredient B, in thermal working relationship with the ingredient A, producing a moiety which changes the adhesion between the hydrophobic thermosensitive layer and the adjoining hydrophilic surface, for the production of lithographic printing plates, wherein the heating does not reduce the solubility of any thermally produced image-defining areas in a solvent or solvent mixture used in the coating of the hydrophobic thermosensitive layer or in a solvent mixture of organic solvent from the group consisting of water-miscible alcohols and ketones and water.
- thermographic material capable of being used to produce a lithographic printing plate, comprising a support, a hydrophobic thermosensitive layer and a hydrophilic surface adjoining the hydrophobic thermosensitive layer, the hydrophobic thermosensitive layer containing an ingredient A which upon heating reacts with at least one other ingredient B, in thermal working relationship with the ingredient A, producing a moiety which changes the adhesion between the hydrophobic thermosensitive layer and the adjoining hydrophilic surface and wherein the hydrophilic surface is the surface of a hydrophilic layer which is the outermost layer.
- the image-wise thermal development step includes image-wise heating for example with a thermal head or with a laser in heat mode.
- the image-wise thermal development step consists of image-wise exposure with a source of actinic radiation followed by overall heating of the photothermographic materials.
- Separation of those parts of the hydrophobic thermosensitive layer with reduced adhesion to the adjoining hydrophilic surface of those parts of the hydrophilic layer with reduced adhesion to the adjoining hydrophobic thermosensitive layer can be achieved by all techniques known to people skilled in the art, which do not adversely affect the quality of the lithographic printing plate thereby obtained e.g. cold lamination followed by stripping (such as with adhesive tape), brushing, wiping with a non-aggressive liquid such as 2-propanol, hot lamination followed by stripping etc.
- thermographic material is also provided, according to the present invention, wherein the ingredient A is a substantially light insensitive organic silver salt and the ingredient B in thermal working relationship with the ingredient A is a reducing agent capable upon heating of reducing the substantially light insensitive organic salt to produce a hydrophobic moiety which reduces the adhesion between the hydrophobic thermosensitive layer and the adjoining hydrophilic surface.
- thermographic material is further provided, according to the present invention, wherein a photosensitive agent is present in the hydrophobic thermosensitive layer which after exposure is capable of catalyzing the reaction between the ingredient A and the ingredient B to produce the moiety which changes the adhesion between the hydrophobic thermosensitive layer and the adjoining hydrophilic surface.
- the hydrophobic thermosensitive layer is coated on a hydrophilic surface.
- the hydrophilic surface may be the surface of a hydrophilic layer or may be the surface of the support.
- the hydrophobic thermosensitive layer is the outermost layer.
- it will be coated on a hydrophilic surface and image-wise thermal development will produce a change in adhesion between the hydrophobic thermosensitive layer and this hydrophilic surface.
- the parts of the hydrophobic thermosensitive layer removed will correspond to the thermally imaged parts or to the non-thermally imaged parts depending on whether thermal imaging results in a reduction or an increase in the adhesion of the hydrophobic thermosensitive layer to the adjoining hydrophilic surface.
- the hydrophilic layer is the outermost layer providing an adjoining hydrophilic surface for the hydrophobic thermosensitive layer.
- image-wise thermal development will produce a change in adhesion between the surface of the hydrophilic layer adjoining the hydrophobic thermosensitive layer and the hydrophobic thermosensitive layer itself.
- the parts of the hydrophilic layer removed will correspond to the thermally imaged parts or the non-thermally imaged parts depending on whether thermal imaging results in a reduction or an increase in the adhesion of the the hydrophilic surface of the hydrophilic layer adjoining the hydrophobic layer and the hydrophobic thermosensitive layer.
- the hydrophobic thermosensitive layer may be coated on a hydrophilic surface provided that no delamination of the thermosensitive layer from this hydrophilic surface takes places during the image-wise thermal development process.
- the thermosensitive layer may consist of one or more elements, the one or more elements comprising binder layers containing at least one of the ingredient A, the ingredient B, the photosensitive agent, a spectrally sensitizing dye, an acutance dye, or other ingredient active in the image-wise thermal development process with the proviso that ingredients involved in the reaction of ingredient A with ingredient B to produce upon thermal development the moiety which strongly changes the adhesion between the thermosensitive layer and an adjoining hydrophilic surface are in thermal working relationship with one another.
- reaction couple which, according to the present invention, upon the application of heat is capable of producing a moiety capable of changing the adhesion between the hydrophobic thermosensitive layer and an adjoining hydrophilic surface.
- reaction couples are: an organic heavy metal salt and a reducing agent therefor; an organic reducing agent and an oxidizing agent therefore; a thermally polymerizable monomer or monomers and a thermally activatable source of free radicals e.g.
- azo-compounds such as 4,4'-azobis(4-cyanovaleric acid), 1,1'-azobis(cyclohexanecarbonitrile), ⁇ , ⁇ '-azobisisobutyronitrile producing upon image-wise thermal development an adhesion-reducing or adhesion-increasing polymer; a masked thermally diffusible hydrophilic moiety (non-diffusible in masked form) whose mask is removable with combined action of heat and a base together with such a base producing upon image-wise thermal development an increased adhesion; a masked thermally diffusible hydrophobic moiety (non-diffusible in masked form) whose mask is removable with combined action of heat and a base together with such a base producing upon image-wise thermal development a reduced adhesion; a masked thermally diffusible hydrophilic moiety (non-diffusible in masked form) whose mask is removable with combined action of heat and an acid together with such an acid producing
- Ingredient A may, for example, be a substantially light-insensitive organic heavy metal salt.
- Organic heavy metal salts particularly suited for use in the thermographic materials according to the present invention are organic silver, iron and nickel salts, with organic silver salts being preferred.
- Preferred organic silver salts according to the present invention are silver salts of aliphatic carboxylic acids known as fatty acids, wherein the aliphatic carbon chain has preferably at least 12 C-atoms, e.g. silver laurate, silver palmitate, silver stearate, silver oleate and silver behenate, which silver salts are also called "silver soaps"; and silver salts with a halogen atom or a hydroxyl on the aliphatic carboxylic acid, e.g.
- Silver salts of compounds containing mercapto or thione groups and derivatives thereof can also be used.
- Preferred examples of these compounds include a silver salt of 3-mercapto-4-phenyl-1,2,4-triazole, a silver salt of 2-mercaptobenzimidazole, a silver salt of 2-mercapto-5-aminothiadiazole, a silver salt of 2-(ethylglycolamido)benzothiazole, a silver salt of thioglycolic acid, a silver salt of a dithiocarboxylic acid; a silver salt as described in US-P 4,123,274 and a silver salt of a thione compound such as a silver salt of 3-(2-carboxyethyl)-4-methyl-4-thiazoline-2-thione as disclosed in US-P 3,301,678.
- a silver salt of a compound containing an imino group may be used.
- Preferred examples of these compounds include silver salts of benzotriazole and derivatives thereof; silver salts of halogen-substituted benzotriazoles; silver salts of carboimidobenzotriazoles; silver salts of 1,2,4-triazoles or 1-H-tetrazoles as described in US-P 4,220,709; silver salts of imidazoles and imidazole derivatives; other organic silver salts as described in GB-P 1,439,478, e.g. silver phthalazinone; etc. Further are mentioned silver imidazolates and the substantially light-insensitive inorganic or organic silver salt complexes described in US-P 4,260,677.
- Useful substantially light-insensitive organic iron salts are e.g. iron salts of an organic acid, e.g. the iron salts described in EP-A 520 404, more particularly iron o-benzoylbenzoate.
- a useful substantially light-insensitive organic nickel salt, nickel stearate, is described in CA-P 763,903.
- Ingredient B is preferably a reducing agent.
- Suitable organic reducing agents for the reduction of substantially light-insensitive organic heavy metal salts are organic compounds containing at least one active hydrogen atom linked to O, N or C, such as is the case with, aromatic di- and tri-hydroxy compounds; aminophenols; METOL (tradename); p-phenylenediamines; alkoxynaphthols, e.g. 4-methoxy-1-naphthol described in US-P 3,094,41; pyrazolidin-3-one type reducing agents, e.g.
- PHENIDONE (tradename); pyrazolin-5-ones; indan-1,3-dione derivatives; hydroxytetrone acids; hydroxytetronimides; hydroxylamine derivatives such as for example described in US-P 4,082,901; hydrazine derivatives; and reductones e.g. ascorbic acid; see also US-P 3,074,809, 3,080,254, 3,094,417 and 3,887,378.
- Preferred reducing agents among aromatic di- and tri-hydroxy compounds having at least two hydroxy groups in ortho- or para-position on the same aromatic nucleus are hydroquinone and substituted hydroquinones, catechol and substituted catechols, pyrogallol and substituted pyrogallols, such as gallic acid and gallic acid esters.
- Particularly useful are polyhydroxy spiro-bis-indane compounds, especially these corresponding to the following general formula (I): wherein :
- polyhydroxy-spiro-bis-indane compounds described in US-P 3,440,049 as photographic tanning agent are mentioned, more especially 3,3,3',3'-tetramethyl-5,6,5',6'-tetrahydroxy-1,1'-spiro-bis-indane and 3,3,3',3'-tetramethyl-4,6,7,4',6',7'-hexahydroxy-1,1'-spiro-bis-indane.
- Indane is also known under the name hydrindene.
- catechol-type reducing agents by which is meant reducing agents containing at least one benzene nucleus with two hydroxy groups (-OH) in ortho-position, catechol, 3-(3,4-dihydroxyphenyl)propionic acid, 1,2-dihydroxybenzoic acid, gallic acid and its esters e.g. methyl gallate, ethyl gallate, propyl gallate, tannic acid, and 3,4-dihydroxy-benzoic acid esters are preferred.
- catechol-type reducing agents are benzene compounds in which the benzene nucleus is substituted by no more than two hydroxy groups which are present in 3,4-position on the nucleus and have in the 1-position of the nucleus a substituent linked to the nucleus by means of a carbonyl group.
- the reducing agent must be present in such a way that it is able to diffuse to the substantially light-insensitive organic heavy metal salt particles to enable the reduction of the substantially light-insensitive organic heavy metal salt.
- auxiliary reducing agents are e.g. sterically hindered phenols, that on heating become reactive partners in the reduction of the substantially light-insensitive organic silver salt such as silver behenate, such as described in US-P 4,001,026; or are bisphenols, e.g. of the type described in US-P 3,547,648.
- the auxiliary reducing agents may be present in the imaging layer or in a polymeric binder layer in thermal working relationship thereto.
- auxiliary reducing agents are sulfonamidophenols corresponding to the following general formula : Aryl-SO 2 -NH-Arylene-OH in which :
- auxiliary reducing agents that may be used in conjunction with the above mentioned primary reducing agents are organic reducing metal salts, e.g. stannous stearate described in US-P 3,460,946 and 3,547,648.
- Photosensitive agents capable of rendering the thermographic materials photothermographic i.e. being able upon exposure of forming a species capable of catalyzing the reduction of the silver ions of the organic silver salt to silver by a reducing agent in thermal working relationship therewith upon the application of heat, should be in intimate contact with the organic silver salt. This can be achieved by producing the photosensitive agent "ex situ” and then adding it to the organic silver salt or "in situ” by preparing the photosensitive agent in the presence of the organic silver salt.
- Suitable photosensitive agents therefor are heavy metal organic or inorganic salts, preferably of a Group 1b metal of the Periodic Table, with metal diazo-sulfonate salts; salts of a hydrogen halide, such as chloride, bromide or iodide; or salts of nitric or sulfinic acid being preferred.
- Suitable metals include silver, copper, chromium, cobalt, platinum and gold; with silver being preferred. Mixtures of the above may also be used.
- This coated filter paper is then exposed to light (about 5-10s with RS sun lamps - 6 inches' distance) and heated to about 90-100°C for 5s. If the exposed paper darkens more rapidly than a similar paper sample under the same conditions without the metal salt, the salt is suitable as a photosensitive generator of a catalyst.
- Preferred photosensitive agents are silver halides with silver chloride, silver bromide, silver bromochloride, silver bromoiodide, silver chlorobromoiodide and mixtures thereof being particularly preferred.
- Very fine grain photographic silver halide is especially useful.
- the photographic silver halide can be prepared by any of the known procedures in the photographic art. Such procedures for forming photographic silver halides and forms of photographic silver halides are described, for example, in Research Disclosure, December 1978, Item No. 17029 and Research Disclosure, June 1978, Item No. 17643.
- Tabular grain photosensitive silver halide is also useful, as described in, for example, US-P 4,435,499.
- the photographic silver halide can be unwashed or washed, chemically sensitized, protected against the formation of fog and stabilized against the loss of sensitivity during keeping as described in the above Research Disclosure publications.
- the silver halides can be prepared in-situ as described in, for example, US-P 4,457,075, or prepared ex-situ by methods known in the photographic art. In the case of ex-situ preparation, it may be present during the preparation of the organic heavy metal salt as described, for example, in US-P 3,839,049 or mixed with the organic heavy metal salt after its preparation.
- the photosensitive agent may be spectrally sensitized in the visible spectrum and in the IR-range of the spectrum with various known dyes including cyanine, merocyanine, styryl, hemicyanine, oxonol, hemioxonol and xanthene dyes.
- Useful cyanine dyes include those having a basic nucleus, such as a thiazoline nucleus, an oxazoline nucleus, a pyrroline nucleus, a pyridine nucleus, an oxazole nucleus, a thiazole nucleus, a selenazole nucleus and an imidazole nucleus.
- Useful merocyanine dyes which are preferred include those having not only the above described basic nuclei but also acid nuclei, such as a thiohydantoin nucleus, a rhodanine nucleus, an oxazolidinedione nucleus, a thiazolidinedione nucleus, a barbituric acid nucleus, a thiazolinone nucleus, a malononitrile nucleus and a pyrazolone nucleus.
- acid nuclei such as a thiohydantoin nucleus, a rhodanine nucleus, an oxazolidinedione nucleus, a thiazolidinedione nucleus, a barbituric acid nucleus, a thiazolinone nucleus, a malononitrile nucleus and a pyrazolone nucleus.
- imino groups or carboxyl groups are particularly effective.
- sensitizing power of these spectral sensitizers may be augmented by the use of so-called supersensitizers such as described, for example for IR-spectral sensitizers in EP-A 559 228, US-P 5,258,282 and JP-A 63023145.
- Thermographic materials rendered photosensitive by the presence of a photosensitive agent may contain anti-halation or acutance dyes which absorb light which has passed through the photosensitive layer, thereby preventing its reflection, such as described in US-P 3,515,559, DE-P 1 927 412, US-P 4,033,948, US-P 4,197,131, EP-A 12 020, CA-P 1,139,149, US-P 4,271,263, EP-B 101 646, EP-B 102 781, US-P 4,752,559, EP-A 377 961, US-P 5,300,420, EP-A 627 660, EP-A 652 473, US-P 5,382,504 and US-P 5,395,747.
- the film-forming binder(s) of the elements of the thermosensitive layer containing ingredients (A) and (B) may be all kinds of natural, modified natural or synthetic resins or mixtures of such resins, wherein the organic heavy metal salt can be dispersed homogeneously: e.g. cellulose derivatives such as ethylcellulose, cellulose esters, e.g.
- cellulose nitrate carboxymethylcellulose, starch ethers, galactomannan
- polymers derived from ⁇ , ⁇ -ethylenically unsaturated compounds such as polyvinyl chloride, after-chlorinated polyvinyl chloride, copolymers of vinyl chloride and vinylidene chloride, copolymers of vinyl chloride and vinyl acetate, polyvinyl acetate and partially hydrolyzed polyvinyl acetate, polyvinyl alcohol, polyvinyl acetals that are made from polyvinyl alcohol as starting material in which only a part of the repeating vinyl alcohol units may have reacted with an aldehyde, preferably polyvinyl butyral, copolymers of acrylonitrile and acrylamide, polyacrylic acid esters, polymethacrylic acid esters, polystyrene and polyethylene or mixtures thereof.
- a particularly suitable polyvinyl butyral containing a minor amount of vinyl alcohol units is marketed under the trade name BUTVARTM B79 by Monsanto USA and provides a good adhesion to paper and properly subbed polyester supports.
- binders or mixtures thereof may be used in conjunction with waxes or "heat solvents” also called “thermal solvents” or “thermosolvents” improving the reaction speed of the redox-reaction at elevated temperature.
- heat solvent in this invention is meant a non-hydrolyzable organic material which is in a solid state in the recording layer at temperatures below 50°C, but becomes a plasticizer for the recording layer where thermally heated and/or a liquid solvent for at least one of the redox-reactants, e.g. the reducing agent for the substantially light-insensitive organic silver salt, at a temperature above 60°C.
- redox-reactants e.g. the reducing agent for the substantially light-insensitive organic silver salt
- Suitable heat solvents are compounds such as urea, methyl sulfonamide and ethylene carbonate as described in US-P 3,667,959; compounds such as tetrahydro-thiophene-1,1-dioxide, methyl anisate and 1,10-decanediol as described in Research Disclosure 15027 published in December 1976; and those described in US-P 3,438,776, US-P 4,740,446, US-P 5,368,979, EP-A 0 119 615, EP-A 122 512 and DE-A 3 339 810.
- stabilizers and antifoggants may be incorporated into the thermographic materials of the present invention.
- suitable stabilizers and antifoggants and their precursors include the thiazolium salts described in US-P 2,131,038 and 2,694,716; the azaindenes described in US-P 2,886,437 and 2,444,605; the urazoles described in US-P 3,287,135; the sulfocatechols described in US-P 3,235,652; the oximes described in GB-P 623,448; the thiuronium salts described in US-P 3,220,839; the palladium, platinum and gold salts described in US-P 2,566,263 and 2,597,915; the tetrazolyl-thio-compounds described in US-P 3,700,457; the 1,2,4-triazole compounds described in GB-P 1,5
- Thermographic and photothermographic materials according to the present invention may contain one or more toning agents.
- the toning agents should be in thermal working relationship with the substantially light-insensitive organic heavy metal salts and reducing agents during thermal processing. Any known toning agent from thermography or photothermography may be used.
- Suitable toning agents are the phthalimides and phthalazinones within the scope of the general formulae described in US-P 4,082,901 and the toning agents described in US-P 3,074,809, US-P 3,446,648 and US-P 3,844,797.
- Particularly useful toning agents are the heterocyclic toner compounds of the benzoxazine dione or naphthoxazine dione type within the scope of following general formula are described in GB-P 1,439,478 and US-P 3,951,660, in particular benzo[e] [1,3]oxazine-2,4-dione.
- the recording layer may also contain other additives such as free fatty acids, surface-active agents, antistatic agents, e.g. non-ionic antistatic agents including a fluorocarbon group, e.g. F 3 C(CF 2 ) 6 CONH(CH 2 CH 2 O)-H; silicone oil, e.g. BAYSILONETM ⁇ l A (BAYER AG); ultraviolet light absorbing compounds and/or silica.
- antistatic agents e.g. non-ionic antistatic agents including a fluorocarbon group, e.g. F 3 C(CF 2 ) 6 CONH(CH 2 CH 2 O)-H
- silicone oil e.g. BAYSILONETM ⁇ l A (BAYER AG)
- ultraviolet light absorbing compounds and/or silica e.g. BAYSILONETM ⁇ l A (BAYER AG
- the support for the thermographic material according to the present invention may be transparent, translucent or opaque and is preferably a flexible carrier made e.g. from paper, polyethylene coated paper, metal, e.g. aluminium, an aluminum alloy, the aluminum content of which is at least 95%, or transparent resin film, e.g. made of a cellulose ester, e.g. cellulose triacetate, polypropylene, polycarbonate or polyester, e.g. polyethylene terephthalate.
- the support may be in sheet, ribbon or web form and subbed if needs be to improve the adherence to the thereon coated thermosensitive layer or made hydrophilic to provide a hydrophilic surface.
- the support may be made of an opacified resin composition, e.g.
- opacified polyethylene terephthalate by means of pigments and/or micro-voids and/or is coated with an opaque pigment-binder layer, and may be called synthetic paper, or paperlike film; information about such supports can be found in EP's 194 106 and 234 563 and US-P's 3,944,699, 4,187,113, 4,780,402 and 5,059,579.
- the preparation of aluminum or aluminum alloy foils with a hydrophilic surface comprises the following steps : graining, anodizing, and optionally sealing the foil.
- the electrochemical graining process is preferred because it can form a uniform surface roughness having a large average surface area with a very fine and even grain.
- thermal printing image signals are converted into electric pulses and then through a driver circuit selectively transferred to a thermal printhead.
- the thermal printhead consists of microscopic heat resistor elements, which convert the electrical energy into heat via Joule effect.
- the electric pulses thus converted into thermal signals manifest themselves as heat transferred to the surface of the thermal paper wherein the chemical reaction resulting in colour development takes place.
- Such thermal printing heads may be used in contact or close proximity with the recording layer.
- the operating temperature of common thermal printheads is in the range of 300 to 400°C and the heating time per picture element (pixel) may be less than 1.0ms, the pressure contact of the thermal printhead with the recording material being e.g. 19.6 to 49.0 kPa (200-500gf/cm 2 ) to ensure a good transfer of heat.
- Suitable thermal printing heads are e.g. a Fujitsu Thermal Head (FTP-040 MCS001), a TDK Thermal Head F415 HH7-1089 and a Rohm Thermal Head KE 2008-F3.
- Thermographic materials can also be image-wise or pattern-wise heated by means of a modulated laser beam.
- image-wise modulated infra-red laser light is absorbed in the thermographic material by infra-red light absorbing substances converting infra-red radiation into the heat necessary for the imaging reaction.
- the thermographic material contains light-into-heat converting substances, e.g. infrared radiation absorbing substances such as described in WO 95/07822 and US-P 5,409,797.
- infrared radiation emitting laser and a dye-donor element containing an infrared light absorbing material is described e.g. in US-P 4,912,083.
- Suitable infra-red light absorbing dyes for laser-induced thermal dye transfer are described e.g. in US-P 4,948,777, which US-P documents for the dyes and lasers applied in direct thermal imaging have to be read in conjunction herewith.
- the image-wise applied laser light has not necessarily to be infrared light since the power of a laser in the visible light range and even in the ultraviolet region can be thus high that sufficient heat is generated on absorption of the laser light in the thermographic material.
- laser which may be a gas laser, gas ion laser, e.g. argon ion laser, solid state laser, e.g. Nd:YAG laser, dye laser or semi-conductor laser.
- thermographic materials light absorbing substances, so-called anti-halation or acutance dyes, may be necessary which absorb light which has passed through the layer, thereby preventing its reflection, such as described in US-P 3,515,559, DE-P 1 927 412, US-P 4,033,948, US-P 4,197,131, EP-A 12 020, CA-P 1,139,149, US-P 4,271,263, EP-B 101 646, EP-B 102 781, US-P 4,752,559, EP-A 377 961, US-P 5,300,420, EP-A 627 660, EP-A 652 473, US-P 5,382,504 and US-P 5,395,747.
- the image signals for modulating the laser beam or current in the micro-resistors of a thermal printhead are obtained directly e.g. from opto-electronic scanning devices or from an intermediary storage means, e.g. magnetic disc or tape or optical disc storage medium, optionally linked to a digital image work station wherein the image information can be processed to satisfy particular needs.
- an intermediary storage means e.g. magnetic disc or tape or optical disc storage medium
- EP-B 654 355 describes a method for making an image by image-wise heating by means of a thermal head having energizable heating elements, wherein the activation of the heating elements is executed duty cycled pulsewise.
- thermographic material can also be carried out using an electrically resistive ribbon incorporated into the material, consisting e.g. of a multilayered structure in which a carbon-loaded polycarbonate is coated with a thin aluminium film (ref. Progress in Basic Principles of Imaging Systems - Proceedings of the International Congress of Photographic Science GmbH (Cologne), 1986 ed. by Friedrich Granzer and Erik Moisar - Friedr. Vieweg & Sohn - Braunschweig/Wiesbaden, Figure 6. p. 622). Current is injected into the resistive ribbon by electrically addressing a printing head electrode contacting the carbon-loaded substrate, thus resulting in highly localized heating of the ribbon beneath the energized electrode.
- the aluminium film may make direct contact with the heat-sensitive recording layer or its protective outermost layer.
- thermographic material heat is generated directly in the resistive ribbon and only the travelling ribbon gets hot (not the print heads) an inherent advantage in printing speed is obtained.
- thermal printing head technology the various elements of the thermal printing head become hot and must cool down before the head can print without cross-talk in a next position.
- Image- or pattern-wise thermal development of the thermographic material may also proceed by means of pixelwise modulated ultrasound, using e.g. an ultrasonic pixel printer as described e.g. in US-P 4,908,631.
- the image signals for modulating the ultrasonic pixel printer, laser beam or electrode current are obtained directly e.g. from opto-electronic scanning devices or from an intermediary storage means, e.g. magnetic disc or tape or optical disc storage medium, optionally linked to a digital work station wherein the image information can be processed to satisfy particular needs.
- an intermediary storage means e.g. magnetic disc or tape or optical disc storage medium
- Photothermographic materials may be exposed with radiation of wavelength between an X-ray wavelength and a 5 microns wavelength with the image either being obtained by pixel-wise exposure with a finely focussed light source, such as a UV, visible or IR wavelength laser, such as a He/Ne-laser or an IR-laser diode, e.g. emitting at 780, 830 or 850nm; or a light emitting diode, for example one emitting at 659nm; or by direct exposure to light reflected from the object itself or an image therefrom with appropriate illumination e.g. with UV, visible or IR light.
- a finely focussed light source such as a UV, visible or IR wavelength laser, such as a He/Ne-laser or an IR-laser diode, e.g. emitting at 780, 830 or 850nm; or a light emitting diode, for example one emitting at 659nm; or by direct exposure to light reflected
- any layer of the thermal recording material of the present invention may proceed by any coating technique e.g. such as described in Modern Coating and Drying Technology, edited by Edward D. Cohen and Edgar B. Gutoff, (1992) VCH Publishers Inc. 220 East 23rd Street, Suite 909 New York, NY 10010, U.S.A.
- thermosensitive layer
- a transparent subbed polyethylene terephthalate support having a thickness of 175 ⁇ m was doctor blade-coated from a coating composition containing 2-butanone as a solvent and the following ingredients so as to obtain thereon after drying a layer containing: silver behenate 4.7g/m 2 polyvinylbutyral [ButvarTM B79 from Monsanto] 18.9g/m 2 benzo[e][1,3]oxazine-2,4-dione (toning agent) 0.33g/m 2 n-butyl 3,4-dihydroxybenzoate (reducing agent) 1.22g/m 2 silicone oil [BaysiloneTM ⁇ l from Bayer AG] 0.04g/m 2 tetrachlorophthalic anhydride (stabilizer) 0.15g/m 2 pimelic acid (inhibitor) 0.5g/m 2
- thermosensitive layer An outermost hydrophilic layer was doctor blade-coated onto the thermosensitive layer from an aqueous coating suspension containing the following ingredients in such quantities so as to yield after drying a coating containing: polyvinylalcohol [PolyviolTM WX48 20 from Wacker Chemie AG] 2.2g/m 2 tetramethyl orthosilicate 2.9g/m 2 polytetrafluoroethene powder [HostaflonTM TF5032 from Hoechst AG] 0.45g/m 2 polyamide wax [CeridustTM 3910 from Hoechst AG] 0.13g/m 2 talcum [MicroaceTM Talc P3 from Nippon Talc Co. Ltd.
- thermographic material 10cm x 10cm sheets of the resulting thermographic material were then image-wise thermally developed with a DRYSTARTM printer from AGFA-GEVAERT N.V. (a thin film thermal head printer) operated at a resolution of 300dpi, a line time of 19ms (the line time being the time needed for printing one line), a duty cycle of 70%, an average printing power (being the total amount of electrical input energy during one line time divided by the line time and by the surface area of the heat-generating resistors) was 5W/mm 2 and an applied pressure between the thermographic material and the thermal head of ca. 225.6 N/linear m (230gf/linear cm) along the thermal head.
- a DRYSTARTM printer from AGFA-GEVAERT N.V.
- thermographic material After image-wise thermal development the sheet of thermographic material was allowed to cool to room temperature.
- the outermost hydrophilic layer on the same side of the thermographic material as the thermosensitive layer was then contacted with adhesive tape, TESATM 4122 from Beiersdorf AG.
- the tape was then peeled off with those areas of the outermost hydrophilic layer corresponding to the image-wise thermally developed areas of the thermographic material still attached to it, thereby detaching these parts of the outermost hydrophilic layer from the thermosensitive layer.
- a 0.15 mm thick aluminium foil lithographic plate was used which had been electrochemically roughened and anodized to form a hydrophilic surface with a surface topography with an average center-line roughness Ra, according to DIN 4768 and ISO 4287/1, of 0.5 ⁇ m, using convention production techniques for lithographic plates.
- An silver halide emulsion consisting of 3.11% by weight of silver halide particles consisting of 97mol% silver bromide and 3mol% silver iodide with an weight average particle size of 50nm, 0.47% by weight of phthaloylgelatin, type 16875 from ROUSSELOT as dispersing agent in deionized water was prepared using conventional silver halide preparation techniques such as described, for example, in T.H. James, "The Theory of the Photographic Process", Fourth Edition, Macmillan Publishing Co. Inc., New York (1977), Chapter 3, pages 88-104.
- a silver behenate/silver halide emulsion was prepared by adding a solution of 6.8kg of behenic acid in 67L of 2-propanol at 65°C to a 400L vessel heated to maintain the temperature of the contents at 65°C, converting 96% of the behenic acid to sodium behenate by adding with stirring 76.8L of 0.25M sodium hydroxide in deionized water, then adding with stirring 10.5kg of the above-described silver halide emulsion at 40°C and finally adding with stirring 48L of a 0.4M solution of silver nitrate in deionized water. Upon completion of the addition of silver nitrate the contents of the vessel were allowed to cool and the precipitate filtered off, washed, slurried with water, filtered again and finally dried at 40°C for 72 hours.
- the coating composition for the emulsion layer of the photothermographic material was prepared by adding the following solutions or liquids to 40.86g of the above-mentioned silver behenate/silver halide emulsion in the following sequence with stirring: 6.87g of 2-butanone, 0.95g of a 9% solution of tetramethylammonium bromide perbromide in methanol followed by 2 hours stirring, 0.2g of a 11% solution of calcium bromide in methanol and 1.39 of 2-butanone followed by 30 minutes stirring, a solution consisting of 0.21g of LOWINOXTM 22IB46, 0.5g of TMPS and 9.24g of 2-butanone followed by 15 minutes stirring, 1.8g of a 0.11% solution of SENSI in methanol followed by 30 minutes stirring and finally 4.35g of ButvarTM B76 followed by 45 minutes stirring.
- a outermost hydrophobic layer coating composition for the photothermographic material was prepared by dissolving 4.08g of CAB and 0.16g of PMMA in 56.06g of 2-butanone and 5.2g of methanol and adding the following solutions or liquids with stirring in the following sequence: 0.5g of phthalazine, 0.2g of 4-methylphthalic acid, 0.1g of tetrachlorophthalic acid, 0.2g of tetrachlorophthalic acid anhydride and a solution consisting of 2.55g of LOWINOXTM 22IB46 and 5.95g of 2-butanone.
- the emulsion layer of the photothermographic material was then doctor blade-coated at a blade setting of 100 ⁇ m with a outermost hydrophobic layer composition to a wet layer thickness of 80 ⁇ m, which after drying for 8 minutes at 80°C on an aluminium plate in a drying cupboard produced a layer with the following composition: PMMA 0.16g/m 2 CAB 4.08g/m 2 Phthalazine 0.50g/m 2 4-methylphthalic acid 0.20g/m 2 tetrachlorophthalic acid anhydride 0.20g/m 2 tetrachlorophthalic acid 0.10g/m 2 LOWINOXTM 22IB46 2.55g/m 2
- the photothermographic material was then exposed to an EG&G lamp through a L775-filter and a wedge filter with optical densities varying between 0 and 3.0 in steps of 0.15 for 30s.
- Thermal processing was carried out for 15s with the uncoated side of the photothermographic material in contact with an aluminium drum heated to a temperature of 115°C.
- the optical density variation of the resulting wedge images was evaluated in reflection with a MACBETHTM RD918-SB densitometer with a visual filter. D max - and D min -values of 1.78 and 0.63 respectively were thereby measured.
- the thereby exposed and thermally processed photothermographic material was delaminated by manually applying a piece of TESAPACKTM 4122, an adhesive tape supplied by BEIERSDORF, with pressure to the coated of the photothermographic material and then stripping off the tape at a speed of 6cm s -1 and an angle of 180°, whereupon the exposed areas of the photothermographic coating were stripped from the aluminium plate leaving the unexposed areas of the photothermographic coating unstripped thereby producing a lithographic printing plate.
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Claims (10)
- Utilisation d'un matériau thermographique comprenant un support, une couche thermosensible hydrophobe et une surface hydrophile adjacente à ladite couche thermosensible hydrophobe, ladite couche thermosensible hydrophobe contenant un ingrédient A qui, lorsqu'on le chauffe, réagit avec au moins un autre ingrédient B en relation de travail thermique avec ledit ingrédient A, en produisant une fraction qui modifie l'adhérence entre ladite couche thermosensible hydrophobe et ladite surface hydrophile adjacente pour la production de clichés d'impression lithographique, dans laquelle ladite chaleur ne réduit pas la solubilité de n'importe quelle zone définissant une image produite par voie thermique dans un solvant ou dans un mélange de solvants utilisé dans le coulage de ladite couche thermosensible hydrophobe ou dans un mélange de solvants organiques choisis parmi le groupe constitué par des alcools miscibles à l'eau et des cétones et de l'eau.
- Utilisation selon la revendication 1, dans laquelle ledit ingrédient A est un sel d'argent organique essentiellement non photosensible et ledit ingrédient B en relation de travail thermique avec ledit ingrédient A est un agent de réduction capable, lorsqu'on le chauffe, de réduire ledit sel organique essentiellement non photosensible pour produire une fraction hydrophobe qui réduit l'adhérence entre ladite couche thermosensible hydrophobe et ladite surface hydrophile adjacente.
- Utilisation selon la revendication 1 ou 2, dans laquelle un agent photosensible est présent dans ladite couche thermosensible hydrophobe qui, après l'exposition, est capable de catalyser ladite réaction entre ledit ingrédient A et ledit ingrédient B pour produire ladite fraction qui modifie l'adhérence entre ladite couche thermosensible hydrophobe et ladite surface hydrophile adjacente.
- Utilisation selon l'une quelconque des revendications 1 à 3, dans laquelle ladite couche thermosensible hydrophobe est coulée sur une surface hydrophile.
- Utilisation selon la revendication 4, dans laquelle ladite surface hydrophile est la surface d'une couche hydrophile.
- Utilisation selon la revendication 4, dans laquelle ladite surface hydrophile est la surface dudit support.
- Utilisation selon l'une quelconque des revendications 1 à 6, dans laquelle ladite couche thermosensible hydrophobe est la couche la plus externe.
- Utilisation selon l'une quelconque des revendications précédentes, dans laquelle ledit matériau thermographique est soumis à un développement thermique en forme d'image positive ou négative et à une séparation en forme d'image positive ou négative de ladite couche thermosensible hydrophobe par rapport à ladite surface hydrophile adjacente.
- Matériau thermographique que l'on peut utiliser pour produire un cliché d'impression lithographique, comprenant un support, une couche thermosensible hydrophobe et une surface hydrophile adjacente à ladite couche thermosensible hydrophobe, ladite couche thermosensible hydrophobe contenant un ingrédient A qui, lorsqu'on le chauffe, réagit avec au moins un autre ingrédient B en relation de travail thermique avec ledit ingrédient A en produisant une fraction qui modifie l'adhérence entre ladite couche thermosensible hydrophobe et ladite surface hydrophile adjacente, et dans laquelle ladite surface hydrophile est la surface d'une couche hydrophile qui représente la couche la plus externe.
- Matériau thermographique selon la revendication 9, dans lequel un agent photosensible est présent dans ladite couche thermosensible hydrophobe qui, après l'exposition, est capable de catalyser ladite réaction entre ledit ingrédient A et ledit ingrédient B pour produire ladite fraction qui modifie l'adhérence entre ladite couche thermosensible hydrophobe et ladite surface hydrophile adjacente.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP19960202455 EP0763425B1 (fr) | 1995-09-14 | 1996-09-03 | Matériaux thermographiques et photothermographiques pour la production d'éléments d'impression lithographique et leurs procédés de fabrication |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP95202488 | 1995-09-14 | ||
EP95202488 | 1995-09-14 | ||
EP19960202455 EP0763425B1 (fr) | 1995-09-14 | 1996-09-03 | Matériaux thermographiques et photothermographiques pour la production d'éléments d'impression lithographique et leurs procédés de fabrication |
Publications (2)
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EP0763425A1 EP0763425A1 (fr) | 1997-03-19 |
EP0763425B1 true EP0763425B1 (fr) | 2001-06-27 |
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EP19960202455 Expired - Lifetime EP0763425B1 (fr) | 1995-09-14 | 1996-09-03 | Matériaux thermographiques et photothermographiques pour la production d'éléments d'impression lithographique et leurs procédés de fabrication |
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US6063528A (en) * | 1997-05-20 | 2000-05-16 | Morgan; David A. | Thermosensitive composition |
US5958647A (en) * | 1997-05-20 | 1999-09-28 | Morgan; David A. | Thermosensitive etch resist for forming a mask |
US6387604B2 (en) | 1998-01-28 | 2002-05-14 | Konica Corporation | Processing method of thermally developable photosensitive material |
US8105756B2 (en) * | 2009-02-17 | 2012-01-31 | E. I. Du Pont De Nemours And Company | Method for preparing a printing form using vibrational energy |
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US3679414A (en) * | 1969-08-04 | 1972-07-25 | Minnesota Mining & Mfg | Lithographic plate and method |
EP0653686B1 (fr) * | 1993-11-16 | 2000-01-05 | Agfa-Gevaert N.V. | Elément d'enregistrement d'images, contenant une composition photopolymérisable et méthode pour la production de plaques lithographiques avec cet élément |
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1996
- 1996-09-03 EP EP19960202455 patent/EP0763425B1/fr not_active Expired - Lifetime
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